Which of the following sentences from the passage illustrates the need for further research
A. Smell also inter-wines with taste to create flavor.
B. The molecules somehow trigger the nerve endings, which carry the message
to the olfactory lobes of the brain.
C. The science of smell is so empirical, there is to predictive base for
experiments.
D. Smell or olfaction is a chemo-sense, relying on specialized interactions
between chemicals and nerve endings.